2014-12-16JOHN CHRISTMAN asked:How do I know whether I have a bolt or screw type heating element? The unit is an R-6. The serial number is BU4979685.

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2014-12-16JOHN HORNYAK:The screw type looks like the ones in household units, only the marine units are half the rating.

2014-12-16DEBORAH TERWILLIGER:If you don't get an answer here, I found the technical support from the manufacturer to be very good. They helped me know what to buy when I wasn't sure. I believe I sent an inquiry via the web and they responded within 24 hours. We got the parts from Jamestown and were easily able to replace them and enjoy hot water once again.

2014-12-16CHRIS ROSE:I do not have any experience with this type heater.

2014-12-16DEAN JODRY:I assume it bolts on (with four screws in a square mounting flange). The screw-in type has no visible fasteners, as the unit itself screws directly into the tank.

2014-12-16John Christman:Thanks. I see four bolt heads so I assume it is a bolt type.

2014-07-13STEVE CHANDLER asked:I have a 20-gal, 120 volt water heater without the heat exchanger. It stopped working so I checked the voltage going to the element through the thermostat and got a reading of 120 volts. I replaced the element, but the unit is still not working. Any ideas?

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2014-07-13DEBORAH TERWILLIGER:Message the folks at Raritan support via their website. They are amazingly responsive. In our case we were overheating and replaced the thermostat which did the trick.

2014-07-14CHRIS ROSE:I would check the thermostat that controls the element.

2014-07-14DEAN JODRY:If you do have 120v at the element terminals, I would next measure the resistance of the element. It is possible the replacement element is open. With an immersed operating element, there has to be heat exchanged to the water.

2014-05-13A shopper asked:can a screw in heating element be replaced by a bolt on element ?

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2014-05-13CHRIS ROSE:I do not think you could make the change. The hot water tank has threaded connections and the heater is inserted in the side. There would not be a place to have a gasketed connection.